When I run testdisk, it does immediately find an LVM2 partition in Quick and Deep scans, and while it and the md are both 20TB/18TiB, it says the hard-drive is too small:
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Disk /dev/md0 - 20 TB / 18 TiB - CHS 4883782460 2 4
The harddisk (20 TB / 18 TiB) seems too small! (< 23 TB / 21 TiB)
Check the harddisk size: HD jumpers settings, BIOS detection...
The following partitions can't be recovered:
Partition Start End Size in sectors
Linux LVM 512 0 1 588815615 1 4 39070259200